All you do now is _______your homework.A、completeB、completingC、having complete

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问题 All you do now is _______your homework.

选项 A、complete
B、completing
C、having completed
D、to have completed

答案 A

解析在SVC(主、系、表)句型中，如果主语部分有实义动词do的某种形式。则作主语补足语的不定式既可带to也可不带to。所以，正确答案为A。选项D的不定式时态不当，现在完成时表示已经完成的动作。

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